I'd look on eBay for the aluminum block 5.3. There are companies that sell the complete stand alone package. I'd also look into Novak, advanced adaptors, and might even call around to some shops that specialize in LS swaps. Motech being a leader in LS swaps for jeeps, Robbie runs the place and is stand up fella. Jeep Speed Shop is out of cali but they made their name with hemi's.
I'd put it all down on paper and do all the figuring on price before I spent a dime. Then weigh the options and see if I could stomach it. Honestly 10,000 seems high to me, but I haven't done one. 6 to 8 sounds right, but that's doing everything yourself.
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